Aug. 19, 1989 -- Mark MacPhail was fatally shot in the chest and face in a parking lot while working at an off-duty security job.
- MacPhail heard cries for help from Larry Young, a homeless man who was being harassed by Sylvester Coles over the beer he was carrying, according to court documents.
- Police officer David Owens performs CPR on MacPhail, according to court records.
- Witnesses identified Troy Anthony Davis as the shooter, court documents show.
- A manhunt began immediately and police searched for Davis for four days. After the family hired an attorney, Davis returned to Savannah and turned himself into police, according to police reports.
- Witnesses testified at the time that Davis was also harassing Young and that he began to pistol whip the homeless man.
- Young's girlfriend at the time, Harriet Murray, told jurors MacPhail went rushing over to help and that's when he was shot. "After the police man went down the guy in the white shirt took two or three steps toward the police and shot him on the ground," Murray said in court.
- But questions about who pulled the trigger remain. Coles claims it was Davis, according to court documents. Davis said he and his friend Daryl Collins were following Coles, but that was the extent of their involvement, records show.
- Davis testified that he heard a gunshot and ducked down and took off running.
- Collins also took off running, according to court records. The day after the shooting, Coles contacted an attorney and he and his attorney went to police headquarters and told police Davis was the killer, according to court documents.
- Collins made claims of police coercion during his testimony.
1991 -- Davis was convicted in the murder of MacPhail's after three days of testimony.
- Since the conviction, seven out of nine witnesses have recanted their testimony and an effort to free Davis gained both national and international attention.
- Young, the homeless man who Officer MacPhail tried to help, told CBS News that police coerced him into identifying Davis as the killer.
- Police said they did not coerce anyone.
Feb 26, 1993 -- The Georgia Supreme Court unanimously affirms the conviction and death sentence for Davis.
March 15, 1994 -- Request for new trial made in the Superior Court of Butts County, Ga.
Dec. 16, 1996 -- Evidentiary hearing takes place.
Sept. 9, 1997 -- Georgia Supreme Court denies request for new trial and claim that Davis was not the shooter, according to documents from the Ga. Attorney General's Office.
Oct. 1, 2001 -- U.S. Supreme Court denies request to hear case.
Dec. 14, 2001 -- Request for new trial made in U.S. District Court for the Southern District of Georgia, Savannah Division.
May 13, 2004 -- Request denied by U.S. District Court.
Sept. 7, 2005 -- Case goes before 11th Circuit Court of Appeals.
Sept. 26, 2006 -- 11th Circuit Court of Appeals denies claim that trial was constitutionally unfair.
April 11, 2007 -- Davis files appeal with U.S. Supreme Court.
June 25, 2007 -- U.S. Supreme Court denies request to hear case.
July 17, 2007 -- Date that Davis is set to be executed. Davis files motion for stay of execution.
July 2007 -- The Georgia Board of Pardons and Paroles issues a 90-day stay of execution before Davis is scheduled to be executed by lethal injection. Following the clemency hearings, Davis's attorneys filed an appeal for a new trial with the Georgia Supreme Court.
Aug. 3, 2007 -- Georgia Supreme Court agrees to hear an appeal by Davis's lawyers for a new trial.
Sept. 23, 2008 -- Second date for Davis's execution. U.S. Supreme Court entered a stay of execution.
Oct. 14, 2008 -- U.S. Supreme Court denies case; stay of execution terminated.
Oct. 24, 2008 -- Georgia's high court issued a stay three days before Davis's scheduled execution. It was the third time since July 2007 that Davis had been spared
the death penalty by a late court decision.
Oct. 27, 2008 -- Third execution date for Davis set.
December 2008 -- Davis's lawyers filed the appeal with the 11th Circuit Court, the last place
they could bring their case for a new trial for Davis.
April 2009 -- A federal appeals court rejected Davis's appeal.
May 19, 2009 -- Attorneys for Davis file their final appeal with the U.S. Supreme Court to grant them a new hearing on Davis's case in the U.S. District Court in Savannah.
June 2009 -- The Chatham County District Attorney's Office gets more than 60,000 signatures
from petitions from Davis supporters and the NAACP. There were 11,000 signatures from Chatham County residents. The petitions asked that District Attorney Larry Chisolm reopen the case.
August 2009 -- The U.S. Supreme Court granted Davis's request for a rare evidentiary hearing in the federal
district court in Savannah.
- On the 20th anniversary of MacPhail's death, friends, family and supporters of MacPhail rallied for justice in the case.
June 21, 2010 -- Groups and family members host vigils for both Davis and MacPhail.
June 22, 2010 -- Davis's attorneys present what they say is evidence that he did not kill officer MacPhail. They are seeking a new trial.
June 23, 2010 -- The two-day evidentiary hearing wraps up. The prosecution argued that witnesses' recanting testimony is unreliable and defense did not meet the standards of proving Davis's innocence.
June 24, 2010 -- Judge William T. Moore gave the defense and prosecution a list of questions to answer in the hearing of a man convicted in the fatal shooting of a Savannah police officer. Both sides in the case had a deadline to respond by 5 p.m. July 7.
Aug. 12, 2010 -- Judge Moore said he would not reconsider testimony he refused to hear in court in the case.
Aug. 24, 2010 -- Judge Moore denies Georgia death row inmate Troy Davis's innocence claim after the evidentiary hearing.
Oct. 19, 2010 -- Attorneys for Davis are told they must appeal to the U.S. Supreme Court not the 11th Circuit Court of Appeals.
Jan. 21, 2011 -- Attorneys for Davis appeal to the U.S. Supreme Court.
Attorneys for Davis were told in October that they must appeal the ruling to the U.S. Supreme Court not the 11th Circuit Court of Appeals.
Attorneys for Davis made two arguments in the filing: the 11th Circuit Court of Appeals had jurisdiction to the hear that case, and they should be the ones to review U.S. District Judge William Moore opinion in the first instance. If the 11th Circuit does not have jurisdiction, the Supreme Court should hear Davis's case because he has introduced extensive evidence that he did not commit the crime for which the State of Georgia wishes to execute him, according to Davis's attorney Jason Ewart.
March 28, 2011 -- The Supreme Court rejects an appeal from Davis.
Sept. 7, 2011 - Order issued making Sept. 21 at 7 p.m. Davis's execution date.
The Georgia Board of Pardons and Paroles said a hearing before the board has been scheduled for 9 a.m. Sept. 19 in Atlanta. This would be their opportunity to request clemency.
Nearly 50 Georgia Congress members sign a letter to the Georgia Board of Pardons and Paroles asking for clemency. View the letter.
Sept. 9, 2011 -- Davis's sister launches an online campaign to petition for Davis's clemency.
Sept. 14, 2011 - Davis declines last meal request.
Sept. 15, 2011 -- Advocacy groups including Amnesty International, delivered hundreds of petitions with more than 600,000 signatures urging the state pardons board to grant Davis clemency.
Sept. 16, 2011 -- NAACP members and other groups from Savannah head to Atlanta to attend a march and prayer service for Davis. Supporters have events planned throughout the weekend.
Sept. 17, 2011 -- A prayer service held for Davis and his family at the St. Philip Monumental AME Church in Savannah.
Sept. 19, 2011 -- The Georgia Board of Pardons and Paroles holds a clemency hearing. Davis's lawyers go before the board to ask for clemency.
The board heard testimony from witnesses and family members and jurors from the 1991 trial who say they now believe there is doubt in the case. Outside the building, Davis supporters rallied for his clemency. More than a dozen supporters gathered outside the Chatham County Courthouse for a prayer vigil.
- If granted, Davis would spend the rest of his life behind bars and would be spared from execution.
- If the parole board denies the request, Davis is scheduled to be executed by lethal injection on Wednesday.
Sept. 20, 2011 -- The Georgia Board of Pardons and Paroles rejects request for clemency for Davis.
Sept. 21, 2011 -- Davis is scheduled to be executed at 7 p.m. at the Georgia Diagnostic and Classification Prison in Jackson, Ga.
- The Georgia Board of Pardons and Paroles said it will not reconsider its decision on clemency for Davis.
- Davis's attorney's make two requests: A request was made to Georgia prison officials to allow Davis to take a polygraph test to prove his innocence, but it was denied.
- Another defense attorney also filed a last-minute appeal in Butts County Superior Court, claiming the ballistic testing that linked Davis to the shooting was flawed. There is no word yet on that appeal.
- Another appeal is made to the U.S. Supreme Court just hours before Davis is scheduled to be executed.
- A temporary delay is issued until the U.S. Supreme Court can respond to the last-minute appeal.
- The U.S. Supreme Court refuses to halt the execution of Davis.
Davis was executed by lethal injection and pronounced dead at 11:08 p.m. at the Georgia Diagnostic and Classification Prison in Jackson, Ga.
Oct. 1, 2011 -- A funeral service is held for Davis at Jonesville Baptist Church. Family members as well as several national leaders spoke at the funeral, including individuals from groups such as the NAACP and Amnesty International. The eulogy was delivered by Rev. Raphael Warnock of Atlanta's Ebenezer Baptist Church.